Book/Report FZJ-2018-01910

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A real time 155 GHz millimeter wave interferometer module for electron density measurement in large plasma devices

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1982
Kernforschungsanlage Jülich, Verlag Jülich

Jülich : Kernforschungsanlage Jülich, Verlag, Berichte der Kernforschungsanlage Jülich 1802, 30 p. ()

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Report No.: Juel-1802

Abstract: A homodyne, real time 155 GHz Interferometer channel is deseribed which is one module of a multichannei system for use an TEXTOR tokamale A standing sine wave is generated in a phase bridge by transmitting a frequeney modulated millimeter wave down two unequal interferometer branches. The presence of plasma produces a phase Slip of the sine wave with respect to a reference signal. The phase steift is linear proportional to plasma density for expected TEXTOR plasmas. Long plasma paths give multiradian phase shifts which are recorded by a digital fringe counting system. The accuracy of phase measurement is $\Delta \Phi$ = 2$\pi$/16. Phasechanges of 7$\pi$/8 are accepted per modulation period. The microwave in the measurement brauch of the interferometer is transmitted using a quasioptical technique. Components and technical details are described. The interferometer was tested in a simulation set-up and in two different plasma experiments. Experimental results are presented.


Contributing Institute(s):
  1. Publikationen vor 2000 (PRE-2000)
Research Program(s):
  1. 899 - ohne Topic (POF3-899) (POF3-899)

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 Record created 2018-03-15, last modified 2021-01-29